Brush holder



Oct. 14, 1969 H. MIKKELSEN 3,471,339

BRUSH HOLDER Filed March 21, less United States Patent 3,471,889 BRUSH HOLDER Hans Mikkelsen, Kongeavej 42, Vamdrup, Denmark Filed Mar. 21, 1968, Ser. No. 714,980 Claims priority, application Denmark, Mar. 22, 1967, 1,549/ 67 Int. Cl. A46b 1 7/ 02, 13/00 US. Cl. 15-179 3 Claims ABSTRACT OF THE DISCLOSURE A brush holder for sweepers with rotary roller brushes including a tubular holder means upon which are arranged brush supporting rings. The holder is formed with a series of radially extending spaced elongated projections having flat sides and end bearing faces whereby the latter engage with and support the brush rings.

The present invention relates to a brush holder for sweepers with rotary roller brushes, on which said brush holder the brushes are arranged on brush rings, the internal sides of which abut the brush holder, the external sides carrying radially extending brushes.

As brush holders ordinary circular tubes have been suggested, but such tubes have been considered too heavy, especially in the case of big sweepers where heavy demands are made at the same time on the rigidity and strength of the brush holder.

It has further been suggested to use a system of parallel rods so arranged that generatrices on their external side would form a bearing surface for the brush rings. However, brush holders of this type are not only expensive to produce and assemble, but also difiicult to keep in repair. Finally it has been suggested to design the brush holder as a polygonal tube, to either end of which is fitted a stiff endplate with a rigid journal, the tube sides being principally made of plane pieces of plate, the edges of which are bent for assembly of the plates in a polygonal tube.

Brush holders of this type thus assume a cross section in the form of a simple geometrical figure, such as an equilateral triangle, a square, an equilateral pentagon and an equilateral hexagon, however, so as to be provided at one or more of the apices of the polygon with projecting plate flanges, by means of which the individual polygonal sides are assembled, for instance by welding.

Brush holders of this type lend themselves to simple and cheap production methods, but especially in the case of big sweepers, where the length of the brush holders exceeds 2 metres and may even be more than 5 metres in length, and where the brush diameter may be 50-100 cm., seeing that the diameter of the brush holder is over 25 cm., they will not be adequate and particularly not be sufficiently rigid in use.

The object of the present invention is to provide a brush holder which is as simple and cheap in production as the known brush holders, and capable in all circumstances of being produced so as to ofier safety, stability, and troublefree operation in all circumstances.

The brush holder according to the invention is characteristic in having a body consisting of three or four plane pieces, connected at their longitudinal end edges by means of pieces of plate bent in U-shape, the opening of the U facing the centre of the brush holder.

In this way is achieved a brush holder which in addition to high bending resistance has greater torsional 3,471,889 Patented Oct. 14, 1969 strength than the known brush holders, providing at the same time a good bearing surface for the brush rings.

Appropriately according to the invention 'the body of the U is of such extent that the sum of the bodies amounts to roughly one third of the internal diameter of the brush ring.

The production of the brush holder will be particularly facilitated if according to the invention the ratio between the body of the U and either of its flanges is roughly 4:3.

The brush holder according to the invention may be made of plate, for instance of two parts symmetrical on a plane through its axis, bent in the desired shape and then assembled in a suitable way, for instance welded together.

However, the brush holder may also be made of reinforced plastic, such as reinforced polyester.

The brush holder according to the invention is described in detail below with reference to the drawing, in which FIG. 1 shows a section through an embodiment of the brush holder FIG. 2 shows a section through another embodiment, while FIG. 3 is a perspective view of the embodiment according to FIG. 1, and

FIG. 4 is a perspective and partly sectional view of a modified embodiment of the brush holder according to FIG. 2.

In FIGS. 1 and 2 the circle 1 indicates the internal diameter of the brush rings.

In FIGS. 1 and 3 is shown a brush holder consisting of three plate parts 2, which are connected at their longitudinal edges by means of U-shaped parts 3, the opening of the U facing the centre of the brush holder.

At either end is fitted an end plate 4, which is provided with a central bore 5 for the shaft of the brush holder.

The brush holder is made of plate bent and welded together at 6.

The end plate 4 is cut to fit the section formed by the bent plate and then welded on to the brush holder.

FIG. 2 shows a brush holder consisting of 4 plate parts 12, which at their longitudinal edges are connected by means of U-shaped parts 13, each with the opening of the U facing inwards.

FIG. 4 shows a brush holder of an embodiment corresponding to FIG. 2, but here the end plate is made of a cruciform part 17, whose ends extend into the openings of the U-shaped parts, but which may also be secured to the said U-shaped parts by means of welding, whereas it is not otherwise connected with the plate parts 12. 15 is hole for journal.

Like the brush holder according to FIG. 1 and 3, the plate brush according to FIG. 2 and 4 may be made of plate bent in one piece and welded together at a suitable point, or of several pieces of plate, which may be welded together or simply assembled by simpler means of assembly. The brushes are driven by the brush holder, one or more driving studs extending from the brush rings in towards the brush holder, and the flanges of the U-shaped parts forming excellent bearing surfaces for these driving studs. The brush holder itself is driven from the end, either by the end plate or the cruciform part being provided with coupling devices, or by one or more driving studs from the pinion of the brush extending in over the brush holder in axial direction. Also for this purpose are good bearing surfaces provided by the flange parts of the U-shaped parts.

What I claim is:

1. A brush holder for sweepers with rotary roller brushes comprising a unitary tubular holder means, said holder means being hollow and having a configuration providing a series of integrally formed radially extending equally spaced hollow projections thereon, said projections extending lengthwise of said holder means and having generally parallel fiat sides and flat end bearing faces, said end bearing faces engaging with and supporting the brush rings of the roller brush.

2. A brush holder according to claim 1 wherein said projections are three in number and the flat sides and end faces are generally U-shaped.

3. A brush holder according to claim 1 wherein said projections are four in number and the flat sides and end faces are generally U-shaped.

References Cited UNITED STATES PATENTS 1,907,642 5/ 1933 Demaree.

2,583,336 1/1952 Jones 15-183 3,321,799 5/1967 Hackworth 15179 XR 3,329,986 7/1967 Hackworth 15-179 FOREIGN PATENTS 1,032,286 6/1966 Great Britain.

PETER FELDMAN, Primary Examiner US. Cl. X.R. 15-182; 29-129 

